CVE-2022-26363 Security feature bypass in xen
A flaw in Xen's type reference counting allows PV guests to bypass safety checks via cache non-coherency, potentially leading to privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-26363?
CVE-2022-26363 is a medium-severity vulnerability in Debian Debian Linux, published on 9 Jun 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
x86 pv: Insufficient care with non-coherent mappings T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Xen maintains a type reference count for pages, in addition to a regular reference count. This scheme is used to maintain invariants required for Xen's safety, e.g. PV guests may not have direct writeable access to pagetables; updates need auditing by Xen. Unfortunately, Xen's safety logic doesn't account for CPU-induced cache non-coherency; cases where the CPU can cause the content of the cache to be different to the content in main memory. In such cases, Xen's safety logic can incorrectly conclude that the contents of a page is safe.
Which versions are affected by CVE-2022-26363?
It affects 3 products.
Products include Debian Debian Linux, Fedoraproject Fedora, Xen Xen.
How do I fix CVE-2022-26363?
Apply the vendor's patch.
Is CVE-2022-26363 being exploited?
There is no known exploitation of CVE-2022-26363 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as ALPINE-CVE-2022-26363, DEBIAN-CVE-2022-26363, GHSA-j296-h8mh-r88j, UBUNTU-CVE-2022-26363.